Use the lastIndexOf method to get the file extension name

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var filename:String = "document.jpg";
        var extensionIndex:Number = filename.lastIndexOf( '.' );
        
        var extension:String = filename.substr( extensionIndex + 1, filename.length );
        trace( "The file extension is " + extension );

    }
  }
}

Related examples in the same category

1.	Finding Substrings
2.	Find all the occurrences of a substring.
3.	Use indexOf and lastIndexOf to locate specific string
4.	Use indexOf to check the existance of an substring
5.	Searching for a Substring
6.	Use offset index in indexOf method to search substring
7.	Use indexOf( ) in a while statement to get the indices of every occurrence of a substring
8.	Use lastIndexOf to search string
9.	Use offset in lastIndexOf method
10.	Is indexOf case sensitive
11.	Returns everything before the last period, if any.
12.	Use indexOf in while loop to count the instance of a substring

Use the lastIndexOf method to get the file extension name : indexOf lastIndexOf « String « Flash / Flex / ActionScript

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